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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.nereids.trees.expressions.functions;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.types.DoubleType;
import org.apache.doris.nereids.types.IntegerType;

import java.util.List;

/**
 * if argument 0 is float or double, we should return double signature for round like function.
 */
public interface SearchSignatureForRound extends ExplicitlyCastableSignature {
    @Override
    default FunctionSignature searchSignature(List<FunctionSignature> signatures) {
        List<Expression> arguments = getArguments();
        if (arguments.get(0).getDataType().isFloatLikeType()) {
            if (arguments.size() == 1) {
                return FunctionSignature.ret(DoubleType.INSTANCE).args(DoubleType.INSTANCE);
            } else if (arguments.size() == 2) {
                return FunctionSignature.ret(DoubleType.INSTANCE).args(DoubleType.INSTANCE, IntegerType.INSTANCE);
            }
        }
        return ExplicitlyCastableSignature.super.searchSignature(signatures);
    }
}
